In the summer of 1802 he started down the
Danube with a companion, Jacobson. After six months in Constantinople, he continued through Asia Minor to Smyrna, where he parted company from Jacobsen. He then travelled through the heart of
Asia Minor to
Aleppo. He remained there from November 1803 to April 1805 and studied
Arabic. From this point on, he kept a full journal of his travels (April 1808 to March 1809), describing his exploration of Jordan, Palestine, the wilderness of
Sinai,
Cairo and the
Fayum. In Arabia he traveled from
Medina to
Aden and returned to
Mokha, Yemen, from where he wrote his last letters to Europe in November 1810. In September of the following year he left Mocha with the hope of reaching
Muscat, but was found dead two days later, allegedly poisoned by his guides on orders from the
imam of
Sanaa. ==Publications==